烧结矿碱度是烧结生产中的重要指标，代表烧结矿质量。
参考答案：错
连结“肺主呼吸”和“心主血脉”的中心环节是
A．经脉的相互连结B．气血的相互关系C．宗气的贯通和运行D．心主营、肺主卫之间的相互作用E．以上都不是
By careful observation and precise calculation, Nicolaus Copernicus _____ that there is no one center
in the universe and the sun is the center of the solar system. [ ]
A. believed
B. thought
C. concluded
D. imagined
